Old Ripley, Illinois has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 7 °C (low) to 18.1 °C (high). Annual precipitation averages 1097.5 Millimeters. Old Ripley is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -6.1 °C | 2.9 °C | 69.85 mm |
| February | -4.1 °C | 5.8 °C | 59.94 mm |
| March | 0.9 °C | 11.8 °C | 82.3 mm |
| April | 6.7 °C | 18.7 °C | 122.94 mm |
| May | 12.7 °C | 24 °C | 127.51 mm |
| June | 17.7 °C | 28.9 °C | 116.33 mm |
| July | 19.5 °C | 30.7 °C | 104.39 mm |
| August | 18.2 °C | 30.1 °C | 88.39 mm |
| September | 13.6 °C | 26.8 °C | 82.8 mm |
| October | 7.1 °C | 20.1 °C | 83.06 mm |
| November | 1.4 °C | 11.9 °C | 91.44 mm |
| December | -3.3 °C | 5.6 °C | 68.58 mm |
| Annual | 7 °C | 18.1 °C | 1097.53 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 6b : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |